3DTD/Assets/Scripts/PlacementSystem/CameraSlotClickDetect.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraSlotClickDetect : MonoBehaviour
{
    public Camera mainCamera;
    public LayerMask layerMask;

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            ShootRay();
        }
    }

    void ShootRay()
    {
        Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;

        if (Physics.Raycast(ray, out hit, Mathf.Infinity, layerMask))
        {
            var slotInfo = hit.collider.gameObject.GetComponentInParent<SlotManager>();
            slotInfo.OnClick();

            Debug.Log($"Hit PlacementSlot! At ({slotInfo.x}, {slotInfo.y})");
        }
    }
}